Right after crossing the Carrick-a-Rede rope bridge, the tour headed over to Giants Causeway to see the natural and rather interesting rock formations by the sea. These formations are actually basalt columns that were formed by a volcanic eruption. According to legend the site is the remnants of a bridge built by Fionn Mac Cumhaill (or Finn McCool) as a causeway over to Scotland. The two giants fought amongst one another and Fionn tricked the other giant into smashing the bridge so that the two would not fight again. The landmark is a World Heritage Spot of UNESCO and was just a blast to climb on.
I've never seen a rock formation quite like this and it was enjoyable to take in the natural rocky landscape.